Pharmacology Flashcards
Complications of the gastrointestinal system associated with chronic alcohol use
Mallory-Weiss syndrome, hepatitis, cirrhosis, pancreatitis
Distribution of histamine receptors H1, H2, and H3
Smooth muscle and mast cells; stomach, heart, and mast cells; nerve endings, CNS respectively
H2 antagonist that causes the most interactions with other drugs
Cimetidine
Mechanism of action of statins
inhibits HMG COA reductase
HMG CoA reductase inhibitors are contraindicated in
Pregnancy
Two side effects of HMG COA reductase inhibitors
Rhabdomyolysis and Hepatotoxicity
Two parameters to obtain before initiation of statins
LFT’s, creatine kinase
How grapefruit juice increases statin effect
Inhibit CYP450 3A4
Concurrent use of fibrates and statins increases risk of
Rhabdomyolysis
Class of agents for cholestyramine, colestipol, colesevalem
Bile acid-binding resins
Major nutritional side effect of bile acid-binding resins
Impair absorption of fat soluble vitamins (A,D,E,K)
Fibrates increase activity of
Lipoprotein lipase
Side effect of fenofibrate and gemfibrozil
Gallstone formation
Mechanism of action involves indirect reduction of liver triglyceride synthesis
Niacin, fibrates
Side effects of niacin
Cutaneous flush
Cutaneous flush due to niacin can be reduced by pretreatment with
NSAIDs
Inhibits intestinal cholesterol absorption by inhibiting Niemann Pick C1 Like 1 (NPC1L1) Protein
Ezetimibe
Indication for H2 antagonists
Acid reflux disease, duodenal ulcer and peptic ulcer disease
H1 antihistamine with 5HT2 antagonist activity that is mostly used for carcinoid tumor but may be used to treat serotonin syndrome
Cyproheptadine
Location of serotonin type-3 (5HT-3) receptors
GI tract, vomiting center of medulla
5HT-3 antagonist used for the prevention of chemotherapy-induced nausea and vomiting
Ondansetron and -setrons
H2 blockers
Cimetidine, Ranitidine, Famotidine, Nizatidine
Reversible block of H2 receptors to decrease H+ secretion by parietal cells
Cimetidine, Ranitidine, Famotidine, Nizatidine
Antiandrogenic effects like prolactin release, gynecomastic, impotence, decreased libido in men, can cross BBB and placenta
Cimetidine
H2 blockers that decrease renal excretion of creatinine
Cimetidine and ranitidine
MoA of PPIs
irreversibly inhibits H/K-ATPase in stomach parietal cells
PPIs
Omeprazole, lansoprazole, esomeprazole, pantoprazole, dexlansoprazole
Increased risk of C. Diff, pneumonia, Hip fractures and decrease serum Mg
PPIs
Bind Ulcer base, provides physical protection and allows HCO3- secretion to re-establish pH gradient
Bismuth, Sucralfate
Used to prevent NSAID-induced peptic ulcers, maintenance of PDA and induce labor (ripens cervix)
Misoprostol
Misoprostol Toxicity
Diarrhea, Abortifacient
PGE1 analog, increases productino of mucus in stomach
Misoprostol
Long-acting somatostatin analog
Octreotide
Clinical use for Octreotide
Acute variceal bleeds, acromegaly, VIPoma, and carinoid tumor
S/E of octreotide
Nausea, Cramps, Steatorrhea
3 Types of Antacids
Aluminum hydroxide, calcium carbonate, magnesium hydroxide
Constipation and hypophosphatemia; proximal muscle weakness, osteodystrophy, seizures
Overuse of antacids - Aluminum hydroxide
Hypercalcemia and rebound increase in acid
Overuse of antacids - Calcium carbonate
Diarrhea, hyporeflexia, hypotension, cardiac arrest
Overuse of antacids - Magnesium Hydroxide
Osmotic Laxatives
Magnesium hydroxide, magnesium citrate, polyethylene glycol, lactulose
tx Hepatic encaphalopathy by promoting NH4 excretion
Lactulose
Monoclonal Ab to TNF-alpha
Infliximab
used to tx Crohn, UC, RA, ankylosing spondylitis, psoriasis
Infliximab
reactivates TB
Infliximab
A combination of sulfapyridine (antibacterial) and 5-aminosalicylic acid (anti-inflammatory) activated by colonic bacteria
Sulfasalazine
Clinical Use of Sulfasalazine
Ulcerative Colitis and Crohn
Oligospermia
Toxic effect of Salfasalazine
Control Vomiting post-op and in patients undergoing cancer chemotherapy
Ondansetron
5-HT3 antagonist; decrease vagal stimulation
Ondansetron
S/E of Ondansetron
HA, constipation
D2 antagonist, used for diabetic and post-Sx gastroparesis, antiemetic
Metoclopramide
Toxic effects of Metoclopramide
Increase parkinsonian effects, restlessness, drowsiness, fatigue, depression, nausea, diarrhea
Metoclopramide C/I
Patients with small bowel obstructino of parkinson dx
increases resting tone, contractility, LES tone, motility, doesn’t affect colon
Metoclopramide
Who poops with their shirt off?
Josh Kaplan